vulnerability
Ubuntu: USN-7444-1 (CVE-2023-43796): Synapse vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:N/AC:L/Au:N/C:P/I:N/A:N) | Oct 31, 2023 | Apr 24, 2025 | Apr 25, 2025 |
Severity
5
CVSS
(AV:N/AC:L/Au:N/C:P/I:N/A:N)
Published
Oct 31, 2023
Added
Apr 24, 2025
Modified
Apr 25, 2025
Description
Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System administrators are encouraged to upgrade to Synapse 1.95.1 or 1.96.0rc1 to receive a patch. As a workaround, the `federation_domain_whitelist` can be used to limit federation traffic with a homeserver.
Solution
ubuntu-pro-upgrade-matrix-synapse
References
- CVE-2023-43796
- https://attackerkb.com/topics/CVE-2023-43796
- UBUNTU-USN-7444-1
- URL-https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f
- URL-https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575
- URL-https://ubuntu.com/security/notices/USN-7444-1
- URL-https://www.cve.org/CVERecord?id=CVE-2023-43796
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